Environmental impact on star-forming galaxies in a $z\sim 0.9$ cluster during course of galaxy accretion

Abstract

Galaxies change their properties as they assemble into clusters. In order to understand the physics behind that, we need to go back in time and observe directly what is occurring in galaxies as they fall into a cluster. We have conducted a narrow-band and $J$-band imaging survey on a cluster CL1604-D at $z=0.923$ using a new infrared instrument SWIMS installed at the Subaru Telescope. The narrow-band filter, NB1261, matches to H$\alpha$ emission from the cluster at $z=0.923$. Combined with a wide range of existing data from various surveys, we have investigated galaxy properties in and around this cluster in great detail. We have identified 27 H$\alpha$ emitters associated with the cluster. They have significant overlap with MIPS 24$\mu$m sources and are located exclusively in the star forming regime on the rest-frame $UVJ$ diagram. We have identified two groups of galaxies near the cluster in the 2D spatial distribution and the phase-space diagram, which are likely to be in-falling to the cluster main body. We have compared various physical properties of star forming galaxies, such as specific star formation rates (burstiness) and morphologies (merger) as a function of environment; cluster center, older group, younger group, and the field. As a result, a global picture has emerged on how the galaxy properties are altered as they assemble into a denser region. This includes the occurrence of mergers, enhancement of star formation activity, excursion to the dusty starburst phase, and eventual quenching to a passive phase.

19 pages, 15 figures. Accepted for publication in ApJ. Error bars in Table 2 corrected

References in corpus (17)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• EAZY: A Fast, Public Photometric Redshift Code
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• Galaxy Merger Morphologies and Time-Scales from Simulations of Equal-Mass Gas-Rich Disc Mergers
• On the efficiency and reliability of cluster mass estimates based on member galaxies
• Evolution of the Color-Magnitude Relation in Galaxy Clusters at z ~1 from the ACS Intermediate Redshift Cluster Survey
• Photometric Redshift with Bayesian Priors on Physical Properties of Galaxies
• The environments of starburst and post-starburst galaxies at z=0.4-0.8
• Stellar mass function of cluster galaxies at z $\sim$ 1.5: evidence for reduced quenching efficiency at high redshift
• The Observations of Redshift Evolution in Large Scale Environments (ORELSE) Survey : I. The Survey Design and First Results on Cl 0023+0423 at z = 0.84 and RX J1821.6+6827 at z = 0.82
• The Complex Structure of the Cl 1604 Supercluster at z~0.9
• Gemini Observations of Galaxies in Rich Early Environments (GOGREEN) I: Survey Description
• Glimpsing the Imprint of Local Environment on the Galaxy Stellar Mass Function
• A z=0.9 supercluster of X-ray luminous, optically-selected, massive galaxy clusters
• Chandra Observations of the Cl1604 Supercluster at z=0.9: Evidence for an Overdensity of Active Galactic Nuclei
• Conditional Quenching: A detailed look at the SFR-Density Relation at z ~ 0.9 from ORELSE
• Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9

Cited by in corpus (1)

• On the Effects of Local Environment on Active Galactic Nucleus (AGN) in the Horizon Run 5 Simulation